Abstract
Effects of some processing factors in Gatorizing process were investigated for a high-W and high-Ta Ni-base superalloy. Optimum extrusion temperature to obtain extrudents suitable for superplastic forging laid near but below 1 200°C, although superplastic deformation was materialized in a temperature range of 1 100 through 1 200°C. Hipping preceding extrusion caused lower superplasticity and narrower temperature range in which superplastically forgiable extrudents were available, while it improved ultimate tensile strength at 760°C and elongation at rupture thereby. Decrease in extrusion ratio caused decrease in pressure required for extrusion, but it casued decrease in superplasticity as well as deteriration of tensile strength at 760°C.
